From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20379C43468 for ; Mon, 21 Sep 2020 16:32:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB06B20757 for ; Mon, 21 Sep 2020 16:32:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600705929; bh=IzsgTk2a0yzPVRGmFj4voj4B2GLluXvUHK4Yna+JArA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DYTcF1GzRKE8p5Pok9S3H6lzTF9VAClPon0Ww+fcIbG/PG63TKcCthlLqCtw0irLh ha4i2DHxP62qaaj113TBzT7FZtXAx150I3+dAuS1LVUDf7OWR/RmRxZw5NNqdtgVDK TOXbIAz8SuUevrhi9XTxcmYtRbUqsx0QPMx/xWT8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728391AbgIUQcI (ORCPT ); Mon, 21 Sep 2020 12:32:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:57234 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728316AbgIUQcD (ORCPT ); Mon, 21 Sep 2020 12:32:03 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4697E20757; Mon, 21 Sep 2020 16:32:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600705922; bh=IzsgTk2a0yzPVRGmFj4voj4B2GLluXvUHK4Yna+JArA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OUoNlqZFMbs4Vlausk5l54IVKQwW1Lvn4astHTb6HxS8g6dvl06+/mQrKClviYIE/ iJyAfQiaODDLxU3q1g6xL4IKgALwZUCFCKboBMVc0ZluB+FnVSNYbG6c8s2yMUe34B dWGOFLJjpsHmumomUzQu6PrFsvlmKlgUac6yyibM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, A L , Josef Bacik , Filipe Manana , David Sterba Subject: [PATCH 4.4 17/46] btrfs: fix wrong address when faulting in pages in the search ioctl Date: Mon, 21 Sep 2020 18:27:33 +0200 Message-Id: <20200921162034.130067558@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921162033.346434578@linuxfoundation.org> References: <20200921162033.346434578@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Filipe Manana commit 1c78544eaa4660096aeb6a57ec82b42cdb3bfe5a upstream. When faulting in the pages for the user supplied buffer for the search ioctl, we are passing only the base address of the buffer to the function fault_in_pages_writeable(). This means that after the first iteration of the while loop that searches for leaves, when we have a non-zero offset, stored in 'sk_offset', we try to fault in a wrong page range. So fix this by adding the offset in 'sk_offset' to the base address of the user supplied buffer when calling fault_in_pages_writeable(). Several users have reported that the applications compsize and bees have started to operate incorrectly since commit a48b73eca4ceb9 ("btrfs: fix potential deadlock in the search ioctl") was added to stable trees, and these applications make heavy use of the search ioctls. This fixes their issues. Link: https://lore.kernel.org/linux-btrfs/632b888d-a3c3-b085-cdf5-f9bb61017d92@lechevalier.se/ Link: https://github.com/kilobyte/compsize/issues/34 Fixes: a48b73eca4ceb9 ("btrfs: fix potential deadlock in the search ioctl") CC: stable@vger.kernel.org # 4.4+ Tested-by: A L Reviewed-by: Josef Bacik Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/ioctl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2129,7 +2129,8 @@ static noinline int search_ioctl(struct key.offset = sk->min_offset; while (1) { - ret = fault_in_pages_writeable(ubuf, *buf_size - sk_offset); + ret = fault_in_pages_writeable(ubuf + sk_offset, + *buf_size - sk_offset); if (ret) break;